After an outraged Professor McGonagall finds out that 3-year-old Harry Potter is being abused, she ignores Dumbledore's orders and adopts Harry as her own. Cover picture doesn't belong to me. All characters belong to J.K. Rowling

this is the story of a little girl that's 18! her parents died when she was 12, and she's lived alone but, she always sees someone by her window..but..why?